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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd09b8f7fd84965c13aaf068bf42d59144087f88c26fe68ac7257a4a535d0393' 
  AND token = 'ldRtK0ueJ1kbVbQxcnFTSz7MgOiILE/3tKvfNVnZrNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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