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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4527ec344ea1da5bb9f8dcd3d1dc5e0a9a8b6eaae400d4b4454713759c40aa89' 
  AND token = '3svjKyTEKWEXCRUBCeUrQ7KYFeZRyMoZalrK4Ue3V0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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