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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8711653091a4dc46a64e9e78e063cf42c6d4209f190ca4098eeceda425d858a2' 
  AND token = '+hMma+YUrVtBax1nAnhbDc7WRbEtE4UlNwUQzITAiac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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