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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98cb54f9eb2787da625b1d849c8ea470365155fb3a0f35ad2b2179589bf0188c' 
  AND token = 'Wm3N7XZ+8Ijr2v/kij/tMbTEuXfZHJ/nvSxHsHB0UUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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