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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a59f50e19fb552b9f5d082518fab4194a45f26d28da010ebf4652c8e88908cc' 
  AND token = 'h8egib677qBgnYSdS3vya5HOKjtg+b+gUKBIS30C1EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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