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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89eda6f395d57f79df67788be4863c2a1914abba17bab6f5e360b0c132a9de2' 
  AND token = 'vcvVduX8lg3+sVSmoZv7EmcN29MeiYn+1RlFUMoS0zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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