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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ad6104f693c81d31a41118b3fbb416abe751384679d636752c08fbe35c4e8e' 
  AND token = '7ZWw8AKxOryACIIic00C7pra5/be/2HC3Apvq6UTB7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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