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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2c11c72c1bcd8fae0bdb7e3446dd9b2a98818aa7b2b056c0d3252544de4dc6' 
  AND token = '95B0/uEypMTBAoOWbCsGjcU1jHEsKso2lF9qFo/eExY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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