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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb440ded6e45ef4f83d125842b832a91d7ffc98bc21a9ba22a45a12a11873b3c' 
  AND token = 'BPXXbAwrvk0SXWjvAoxihd3U2Wz+XSFQZRxBJubvj4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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