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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a4784e6e2926ddf9548ed1085b41f110f772fc35d2b2b104187d4f20bb2f7b' 
  AND token = 'csnhY8JeSVBouHq8MQgHHhPEqxUg7GX1y07UowEjBp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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