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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0215781d9706d98fdbbd3b032af57a6d41e33e982a7f2992722ed3840332e61' 
  AND token = 'sig8mxu/DEaf5C4cXngd/7JcJn6lyjfy8c4hXpTqD90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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