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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30bac243e8ed47c184f045f9929eab4139c58f1110ead7eba1bf3eb3f3d281e' 
  AND token = 'txCpkT4R8ry1OIsGYKKo84dxZiVI1MMTOwMKFuXe62c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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