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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b031ff05875d4da6200ad435da28c42acf00ab1ffe2fd0ecd02826721d7fc4a2' 
  AND token = 'ZVfquOJJwRgNf/9NCU/c8RpwKOcxARLxUDJD1zzeyTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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