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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d7fa9925f05bdb254760485dc6f7cf9bd9dd87819366e4c603d980f9cb3f92' 
  AND token = '+IfLWbQ5npsIlISKnB7J5GPSSBerg1Rgo7u00/B/xZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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