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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb33c4b5074190ac4347e3a6ffae8cdfc8b8f36cd3cbb08fa1648fedfe6af7db' 
  AND token = 'vyWpl40nc8o44ELue74j2Ruu9AIwJ17Q/JTzBl87ctQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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