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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6a904cbc77e7c3af1e35fed10756b94a9c9a301fa2adf9527c9d16d3ba562ed' 
  AND token = 'QrDWg3FRXwWk7Q1EjzTvw6VsOA//+pe5kilCH98T580=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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