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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98072ec6e48b17b8b52784d97b28190344ea112c181e365fea4639a78103c08b' 
  AND token = 'miorj8u93nR4pDZ2cEhB39oeHKYyOoMa3tNGdZTIzTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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