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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c4ecda58431c74819eba8344e90621a7768d20760a7b3f99fc6d818122f10e' 
  AND token = 'zmDKTCkr5w35bhgXeie9l6SV94iYX2gzgtvJWsdt/hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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