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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '945f051f98f549155e785d92267819f5a78737d27f39547adffff0bae429156e' 
  AND token = 'N7kNBi4724rjxyUeiEwlg/w60oYC62zwY/5OZSVI1Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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