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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c07e5ec2dad52dd5a4ff99f3b53b2b1bc70efced06218d6059f67c549af1d5d' 
  AND token = 'lQEhvn2hwZGbJx5WmxvMPLSDg76pK3yIP8YKyh5UecY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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