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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be00dedc53c3c53cb4ba6b5abd62d869beaf92ac42e2e215657c9769fa2b5bb8' 
  AND token = 'CAN2GwLLSH27rhlr6Tj2zhX4o+cv07gSLjtvBhaEpkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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