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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b1cf4d838cfdcdab72426aeba29dbc022740f999c2b0bb1c4f394ac03cf7d6' 
  AND token = 'PRfj70croRri6lIHeNQtyNTO4RAhoyXOB7OJBVbO7YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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