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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0482d82c2148cfd08b7fc198f09b5c6a6c1954d27535d0ea0a2ee8b1f407cad1' 
  AND token = 'zSiCR2Av7gNsZbzHXc+eAKIPDFGmjGXuHKAJvT7EN+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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