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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c12e39bc202e7a0ee4a89530f20e262e33f07528ef66b85912c3485a0d09fcb7' 
  AND token = 'OhTi7WQ5qHYUW8czLNMATU0IUxddHNT1ytRfF0+E8lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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