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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b080723c9dc5facffb3d6d765fa06cbbaa5fe519d3c5f53f13ff38e261d8f5f' 
  AND token = 'SGwdNFD2cC1QV0zM0siN5oQpusanYOPLOD8YS6dnIp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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