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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '661b3c09b5c8218cc5dd3dd3fa7db65327e6585543b1b38d22604a2600b46a95' 
  AND token = '3PPkvA6GMmfFL8cDXZ8lzd3xZwI+6apLSxtwKdkvvU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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