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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4569b5433c632d2af58e6a3c55453f4a313ecc0a96f4f3cfcbf7cf949766d11' 
  AND token = 'UfRGxq2O8Y2mP074/fTCAB888DcziayITI4j7F0LS1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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