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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0006b2adc1259963ca8316d6d49b6f6b4f153e526b845d18d9d3e10b3449a833' 
  AND token = 'D1Viy5mUix22/ip0aIU9Ry5gnLCKLkX2p0JK8lVLpQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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