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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8bab11dd31d718e4d85a38a44c62e576c0725ecb78ae716d30c348f4cdc697' 
  AND token = 'yVpvDRsIubbWM4bIakJoY0u39EaMCcKJu8ecqNCeP80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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