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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b014aed8229e69174b55bb2c0d144c33ad259404f8e1e9cd18d2e7db185585' 
  AND token = 'Sxp++/iaBW7B0uwUmhMO82UYMIO08UuJEuaSqBq/nNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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