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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86162940eabd742e07d7d745f2c3f9427209c7efc0a2c934d80d48820b01ef1' 
  AND token = '14bv0s0k6DjqOlQFviPjbDDiq/+GdUCJVczn0dQVDT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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