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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e9ed532de9dc72e76d810e2d9d5546ecc741117979a7c6ce2ab7e00e5e65670' 
  AND token = 'Mf3yt0Vq1DPt744UqEMcEz4yCqk5qBiQeBq9Y5E8MTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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