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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf61173766c51b77ee509ddcc261db63e904658365b925a5d02249af37a2e84' 
  AND token = 'DddczQ7XzFcf5VoVCqxZuKiA1Au6SjU8MU7T6tfRTHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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