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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ba258a7e6f238561759775959ec2364b2c61904e1ffe054f9592fa8a1ab0ca' 
  AND token = 'b7R6Kred2QuckooKKFUSLP9EajMG0+BAZlyJbH4FJS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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