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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c151b4027516da742fb47c798e91cbf6a0211d8817344f01da49c658baafc2' 
  AND token = '4H0RTPtOtLbj7GWS4qVxol5Rvnk1xCRUb2PvtY1y4gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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