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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d94776e13b9d04d98a49cf5118cc6af0260b27908901b95248f219c093df4a' 
  AND token = 'VVpnlcH2KcbfLUDxIPp1/J5KuyRPP6DjOU4LatIsJY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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