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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb66aaafaf5aeb53fa9f6aee893a448eeb829b61f186f2a403eff54650bce5b' 
  AND token = 'b5FOP+MAsBrfuH1DJXLRUIMZcgckpoNDpZorykNAyvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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