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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd0e6e2190cfdc601bd5eee8c2d9cccafb47cb88bcd7815be3a36e8e1a64d2b1' 
  AND token = 'PCJW6yorgUztIUfuVsn1j7pKJq/eFqzAL9TSTDVd+ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}