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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e1e2a53f44c3fd13b915a00503cfe0d2f87e8a51283bc68b6ae8faa7d3d4d8f' 
  AND token = 'mG4hkzAMlp32fVZUGFeKIDTj55Bc9hs2LP0fZqEGG6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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