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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c096d198ef1019fb337e3bf4883b39b017ccb1447a466a75c4e3596a1da616bb' 
  AND token = 'D5fOkF+lL365FJyhT4aZTh6GpW4QsbPejb5TTSUutXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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