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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1beb67c89fbbec16a4ff61587c7dbcd0b3a5783855e9303d8f76f05da790ebe6' 
  AND token = '7DR75k/A1ieYB0X8IYBYDPZNcdXHDf/qcMGMvpfzsEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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