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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce88d4fc54e7d24ba1ef5852df6ac95e69290409723ba7d7b511f01844f9ad6' 
  AND token = 'oebNG5zPy6ffdmdaE+ndhCL824cXsLV6VPLHSFS4bxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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