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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda1304f4bd0c262736493a5456962b5d3956bc4fb3b6e3033851254f1181ddc' 
  AND token = 'LmESh50FHuF/XsandXoVJ4NesjCuqQ1HkkDoh/WjwqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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