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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d713fbde1cce2555b1fb2faf93b5fc170a13e7273fa2b5eb1d08a1e27f0c32c' 
  AND token = 'ZmO72/+36kPHzfZ8DqF+A6ALqEti6OcfW1ktGZXbFus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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