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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a70e03aa90c49443b73f020ff61400252c716d4bb6e21b5cb3ca9dee0ec2c508' 
  AND token = 'KcDYtBdDSV3b99VTqSsi02HH4rJKLvslQk9yoBfYq1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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