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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e06e491698b756447eaeb1397de2ba6a2d753f6d4561df9eeeb694ea547dd2' 
  AND token = 'qq4f6z+X+YZ5L7qJ3LBIj8+lBTiGi6M3IG1mjc9OOOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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