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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d2168cdff8f5ce507adc9ee73d58be5dcdf6e7201a55004f9a4a3bf8b4774c3' 
  AND token = '7Mq4us3pgnx0tBaylGBgIBcpqnZ4R0nUnHtsxM0IFLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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